Oil-burner.



H. B. STILZ.

OIL BURNER.

APPLICATION FILED NOV. 1a. 1908.

Patented Jan. 11,1910.

. HOV/765565 fihn/ MAX Bath, in the county of Sagadahoc and Stateciently atomized to cause perfect combustion 5 suing fluid to beatomized to such an extent HARRY B. STILZ, or BATH, MAINE. I

OIL-BURNER.

Specification of Letters Patent.

Patented Jan. 11, 1910.

Application filed November 18, 1908. Serial No. 463,170.

To all whom it may concern: I Be it known that I,'HARnY B. S'rmz, acitizen of the United States,- residing at ofMaine, have invented a newand useful Oil-Burner, of which the following is a specification. I

My invention relates to improvements in oil burners in which the oil isatomized principally by mechanical means; and the objects of myimprovement are, first, to construct a burner which will eiiicientlyburn any of the different kinds of fuel oil used in practice; second, toreduce to a minimum the amount of air or steam used as an atomizingagency, when starting the flame; third, to produce an oil s ray, which,when under normal firing conditions Wlll be, sufiiwithout the aid of anexternal at'omizing fluid, and fourth, to render'the system simple andeasily accessible for cleaning.

Since it is essential that fuel oil be first partially vaporized beforeit is suitable for combustion, and that the vaporization be effectedwith extreme rapidity, the successful burners employ means for breakingthe oil into a fine mist or spray, which can read-' furnace, as well asbe intimately mixed with the supply of air for supporting combustion.Nozzles of the centrifugal type, which deliver a jet having a high rateof rotation as well as a rectilinear velocity, cause the isthe oil.

that, when operating in conjunction with an ample supply of air into afurnace with established i h temperature, complete combustion is eected. When starting the combustion, however, conditions are such thatauxiliary means are useful to bring desired results. At this stagetheoil should preferably be diluted with air, steam, or other gaseousfluid, which affords an additional agency for not only inducing a strongcurrent of air supply but also for distributing the atomized oil througha large Volume. Rapid evaporation and combustion of the small portion ofoil coming into contact with the igniter, generates ample heat to ignitethe whole jet and with a high temperature within the furnace and anatural or forced draft once established, the centrifugal action of thejet alone breaks the oil into such fine particles that the externalatomizing agency can be reduced to a mini- 1 the axiso'f the nozzle;Fig. 2 1s a section through the axis of the nozzle and Fig. 3 is a planview of the burner with a part of the furnace shown in section.

The nozzle, composed of an outer casing 1 into which is fitted a center2, is constructed so as to form an annular space which graduallydecreases in diameter to that of the orifice 3 through which thedischarge is made. Oil and steam are forced through ports 4. and 5respectively into this annulus near its largest diameter in a lineapproximately tangential to the same and in direc tions as indicated inorder to produce a rotation of the fluids therein in a given direction.The areas of the ports 4 and 5 and the orifice 3 are kept small in orderthat the velocities of rotation and projection may be great, so that theenergy producing the same may be effectively utilized for disintegratingIn order to keep the nozzle free of any solid particles which maybepresent in the oil, a filter is fitted in the oil supply pipe. Thisfilter has a threaded top 7, easily removable, on which is connected asieve 8 of fine mesh through which the oil is obliged to pass beforeentering the nozzle. The sieve 8 can easily be cleaned or replaced by anew one by simply disconnecting it from the top 7 around which it issecured. Oil is supplied to the burner through pipe 9 by any suitablemeans for delivering the oil to the system at the required pressure.Steam is supplied through the pipe 10 from a suitable generator, at apressure preferably greater than is maintained in the oil pipe and thesupply of steam is regulated by the valve 11.

In Fig. 3 the nozzle and filter are shown fastened'to plate 12 in frontof the furnace 13. The jet is introduced into the furnace through anopening shown in the center of plate 12 and ports 14 for the admissionof air are arranged through the channel bar which incloses the s acebetween plate 12 and plate 15 which Forms the front of the fire box. Instarting a fire, a suitable igniting flame is properly placed within thefurnace and oil'under a pressure 25 pounds per square inch or more isintroduced into the nozzle through conduit 9. Steam is likewise admittedto the nozzle through the conduit 10 and the'rate of supply controlledby the valve 11. The tWo fluids mix within the annular space of thenozzle and on issuing from the orifice 3 at a high velocity they inducea strong current of air. When the current of air is suppliedto thefurnace by either forced or natural draft the supply of steam may be cutoff after the combustion has been properly established, the mechan-.ical atomization of the oil alone proving sufficient under theseconditions.

It will be understood that other gases than steam may be used for theatomizing fluid and that departures from the actual construction, suchas a change in the relative positions of the mixing chamber and ports,as Well as the number of the latter, can be made without departing fromthe spirit of the invention for which I claim:

1. A nozzle having an annular space in connection with a concentricorifice, ports leading into said space tangential to said annulus anddirected so as to produce rotation in like direction, and conduits forconveying fluid under pressure to said ports.

2. A nozzle having a restricted discharge orifice and independent inletsfor a gaseous fluid and a liquid, there being a passage from each ofsand inlets to the discharge orifice, said passages having a portion incommon which forms a mixing chamber, and each of said passages beingarran ed to produce a rotary motion in the fluid passing therethroughtoward the discharge orifice.

3. A nozzle having an annular space decreasing gradually in diameter andterminatin in a small centraldischarge orifice, there being portsleading into said space at the larger end thereof along lines at anangle to radii extending from the axis, and conduits connected with saidports for delivering thereto an oil and a gaseous fluid under pressure.

LA nozzle having an annular space in communlcation with a concentricorifice,

there being ports leading into said space along lines at an angle to theradii of the annulus, and directed so as to produce rotation in likedirection, conduits for conveymg fuel oil and a gaseous fluid underpressure to said ports, and means for closing the conduit for supplyingthe gaseous fluid.

HARRY 13. STILZ.

